CN115845211A

CN115845211A - Air and oxygen mixing device for breathing machine

Info

Publication number: CN115845211A
Application number: CN202211594173.1A
Authority: CN
Inventors: 梁惺; 李秋华; 刘晓军; 刘易海; 周传兴; 童真
Original assignee: Chongqing Yongrenxin Medical Equipment Co ltd
Current assignee: Chongqing Yongrenxin Medical Equipment Co ltd
Priority date: 2022-12-13
Filing date: 2022-12-13
Publication date: 2023-03-28

Abstract

The invention provides an air-oxygen mixing device for a breathing machine, which can realize more uniform mixing of air and oxygen; the oxygen supply device comprises a power unit and a base pipe body connected with the power unit, wherein a first pipe body is also arranged in the base pipe body, an oxygen conveying pipe is sleeved in the first pipe body, the front end of the oxygen conveying pipe is provided with a conical part, and a conveying hole is formed in the pipe wall of the conical part; a mixing cavity is also arranged in the first pipe body and is positioned at the front end of the conical part; the front end of the basic pipe body is provided with an output port, and the rear end of the basic pipe body is provided with an air inlet unit; the device also comprises a flow guide cone arranged in the basic pipe body, and the flow guide cone is positioned between the output port and the mixing cavity. The conical part is arranged at the front end of the oxygen conveying pipe, and the conveying holes are formed in the pipe wall of the conical part, so that the mixing uniformity of air and oxygen is improved; and the guide cone can inhibit the mixed gas from generating vortex in the flow and reduce the noise in the flow of the mixed gas.

Description

Air and oxygen mixing device for breathing machine

Technical Field

The invention relates to the technical field of medical instruments, in particular to a breathing machine, and particularly relates to an air-oxygen mixing device for the breathing machine.

Background

In modern clinical medicine, a ventilator has been widely used in respiratory failure due to various reasons, anesthesia and breathing management during major surgery, respiratory support therapy and emergency resuscitation as an effective means for manually replacing the function of spontaneous ventilation, and has a very important position in the modern medical field. At present, a breathing machine is a vital medical equipment which can prevent and treat respiratory failure, reduce complications and save and prolong the life of a patient.

The breathing machines are classified into various types, such as adult or child breathing machines according to application scenarios, and positive or negative pressure breathing machines according to ventilation types, but any type of breathing machine includes components such as a gas source, an exhalation valve, an inhalation valve, a flow valve, and a controller, wherein the gas source is regarded as a core component of the breathing machine.

The prior patent document CN201610402364.1 discloses an air-oxygen mixing structure for a breathing machine and the breathing machine, comprising an air flow detection cavity, an oxygen diversion cavity, an air diversion cavity and a mixing cavity; the inlet end of the air flow detection cavity is an air inlet, and the outlet end of the air flow detection cavity is communicated with the inlet end of the air diversion cavity; a pressure drop perforated wall is arranged in the air flow detection cavity, and a first flow detection port and a second flow detection port are respectively arranged on the front side and the rear side of the pressure drop perforated wall; the air diversion cavity is a cylindrical cavity, the oxygen diversion cavity is a circular cavity arranged at the periphery of the air diversion cavity, and an oxygen inlet is arranged on the outer wall of the oxygen diversion cavity; the inlet ends of the oxygen mixing diversion cavity and the air mixing diversion cavity are respectively communicated with the oxygen diversion cavity and the air diversion cavity, and the outlet ends of the oxygen mixing diversion cavity and the air mixing diversion cavity are communicated with the mixing cavity; the outlet end of the mixing chamber is provided with a mixing perforated wall. Although the structure can realize air-oxygen mixing, the flow guide cavities of the air and the oxygen are in a nearly coaxial sleeve-shaped structure, so that the phenomenon of uneven air-oxygen mixing exists in the central part and the edge part of the mixing area in the mixing area at the front end.

Therefore, how to improve the uniformity of air-oxygen mixing in such a ventilator becomes a technical problem to be solved urgently by those skilled in the art.

Disclosure of Invention

The invention aims to solve the technical problems in the prior art and provides an air-oxygen mixing device for a breathing machine, which can realize more uniform mixing of air and oxygen.

The technical scheme is realized by the following measures, and the air-oxygen mixing device for the breathing machine comprises a power unit and a base pipe body connected with the power unit, wherein a first pipe body is also arranged in the base pipe body, an oxygen conveying pipe is sleeved in the first pipe body, the front end of the oxygen conveying pipe is provided with a conical part, and the pipe wall of the conical part is provided with a conveying hole; a mixing cavity is also arranged in the first pipe body and is positioned at the front end of the conical part; the front end of the basic pipe body is provided with an output port, the rear end of the basic pipe body is provided with an air inlet unit, and the air inlet unit corresponds to the first pipe body; the device also comprises a flow guide cone arranged in the basic pipe body, and the flow guide cone is positioned between the output port and the mixing cavity.

Further, the air inlet unit comprises an air inlet end cover and a filter arranged at the front end of the air inlet end cover.

Furthermore, a radiator is arranged at the front end of the power device.

Further, the mixing cavity is provided with a contraction part, and the front end of the contraction part is also provided with an expansion part.

Furthermore, a first flow guide body is arranged on the flow guide cone and corresponds to the mixing cavity; and a second flow guide body is also arranged on the flow guide cone and corresponds to the output port.

Furthermore, the output port is provided with a third flow guide part, and the third flow guide part corresponds to the second flow guide body.

In particular use, the present application provides an air and oxygen mixing device for a ventilator, comprising a power unit, the power unit being selected from commercially available electric turbines, and a base tube connected to the power unit; the base pipe body is of a cylindrical tubular structure, a front end cover is arranged at the front end of the base pipe body, an output port is formed in the middle of the end cover, and a turbine shell fluid inlet of the electric turbine is aligned with the output port, so that the electric turbine is connected with the base pipe body. The first pipe body is arranged in the base pipe body in a welding or other existing connecting mode, the first pipe body can also be of a tubular structure, an oxygen conveying pipe is sleeved in the first pipe body and used for conveying oxygen, meanwhile, an air inlet unit is arranged at the rear end of the base pipe body, and the air inlet unit can be selectively arranged at an opening at the rear end of the base pipe body, so that air can freely enter and exit; when the oxygen supplying device works, oxygen is input from the oxygen conveying pipe and then is discharged from the conveying hole of the conical part at the front end of the oxygen pipe, and air is input from the air inlet unit and enters the first pipe body; the front end of the oxygen conveying pipe is provided with a mixing cavity; the air and oxygen are mixed at the mixing chamber. In particular, the device also comprises a flow guide cone arranged in the base pipe body, the flow guide cone is positioned between the output port and the mixing cavity; namely, the mixed gas passes through the guide cone and then is output from the output port.

When the air suction device is applied specifically, the power unit forms negative pressure after being started, and air can be sucked from the air inlet unit through the channel in the basic pipe body; meanwhile, the oxygen conveying pipe is externally connected with an existing oxygen bottle or an oxygen conveying unit, oxygen is conveyed to a designated position, mixing of air and oxygen is achieved, and mixed gas formed after mixing is output to a pipeline of the breathing machine from an output port through the flow guide cone.

The beneficial effect that this application produced does: the conical part is arranged at the front end of the oxygen conveying pipe, and the conveying holes are formed in the pipe wall of the conical part, so that the initial movement direction of most of oxygen before mixing is perpendicular to the initial movement direction of air, and then the oxygen enters the mixing cavity along with the air to be mixed, and the mixing uniformity of the air and the oxygen is improved; and the guide cone can inhibit the mixed gas from generating vortex in the flow and reduce the noise in the flow of the mixed gas.

Attached drawings description of the drawings:

FIG. 1 is a schematic view of a first perspective of an air-oxygen mixing device for a ventilator according to the present invention;

FIG. 2 is a schematic view of a second perspective of the air and oxygen mixing device for a ventilator according to the present invention;

FIG. 3 is a schematic view of a first perspective of a portion of the components of the air and oxygen mixing device for a ventilator according to the present invention;

FIG. 4 is a schematic view of a second perspective of a part of the components of the air and oxygen mixing device for a ventilator according to the present invention;

FIG. 5 is a first perspective view of an oxygen delivery tube of the air and oxygen mixing device for a ventilator according to the present invention;

FIG. 6 is a schematic view of another part of the air and oxygen mixing device for a respirator in a first perspective view;

FIG. 7 is a schematic view of another part of the air and oxygen mixing device for a respirator according to the present invention from a first perspective;

fig. 8 isbase:Sub>A sectional view taken along linebase:Sub>A-base:Sub>A of fig. 7.

Fig. 9 is a first view schematically illustrating a flow guiding cone of the air-oxygen mixing device for a respirator of the present invention.

Reference numerals:

100 base tubes, 110 outlet ports, 103 first brackets, 120 air inlet units, 121 inlet end caps, 122 filters, 200 first tubes, 201 first mounting portions, 210 oxygen delivery tubes, 211 oxygen delivery tube joints, 220 conical portions, 221 delivery holes, 230 mixing chambers, 231 constrictions, 232 enlargements, 300 flow guide cones, 310 first flow guides, 320 second flow guides, 330 mounting portions, 410 power units, 420 radiators.

Detailed Description

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection through an intermediate medium, and those skilled in the art will understand the specific meaning of the terms as they are used in the specific case.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

As shown in fig. 1, an air-oxygen mixing device for a breathing machine comprises a power unit 410 and a base tube 100 connected with the power unit 410, wherein a first tube 200 is further arranged in the base tube 100, an oxygen delivery tube 210 is sleeved in the first tube 200, a tapered part 220 is arranged at the front end of the oxygen delivery tube 210, and a delivery hole 221 is arranged on the tube wall of the tapered part 220; a mixing cavity 230 is further arranged in the first pipe body 200, and the mixing cavity 230 is positioned at the front end of the conical part 220; the base pipe 100 has an output port 110 at a front end thereof and an air inlet unit 120 at a rear end thereof, and the air inlet unit 120 corresponds to the first pipe 200; and a guide cone 300 disposed in the base pipe body 100, wherein the guide cone 300 is located between the output port 110 and the mixing chamber 230.

In the embodiment of the application, the air and oxygen mixing device for the breathing machine comprises a power unit 410, wherein the power unit 410 can select an electric turbine in a commercial product, and a base pipe body 100 connected with the power unit 410; the base pipe 100 is a cylindrical tubular structure, a front end cap is disposed at the front end of the base pipe 100, an output port 110 is disposed in the middle of the end cap, and a fluid inlet of a turbine shell of the electric turbine is aligned with the output port 110, so that the electric turbine is connected to the base pipe 100. The first tube 200 is arranged in the base tube 100 by welding or other existing connection modes, the first tube 200 can also be of a tubular structure, an oxygen conveying tube 210 is connected in the first tube 200 and used for conveying oxygen, meanwhile, an air inlet unit 120 is arranged at the rear end of the base tube 100, and the air inlet unit 120 can be selectively arranged at an opening at the rear end of the base tube 100, so that air can freely enter and exit; in the working state of the structure of the present application, oxygen is fed from the oxygen feeding tube 210 and then discharged from the feeding hole 221 of the tapered portion 220 at the front end of the oxygen feeding tube, and air is fed from the air inlet unit 120 and enters into the first tube 200; a mixing chamber 230 is arranged at the front end of the oxygen delivery pipe 210; the air and oxygen are mixed at the mixing chamber 230. Specifically, it further includes a guiding cone 300 disposed inside the base pipe body 100, the guiding cone 300 is located between the output port 110 and the mixing cavity 230; that is, the mixed gas passes through the guide cone 300 and then is output from the output port 110.

In a specific application, the power unit 410 is activated to form a negative pressure, and air can be sucked from the air inlet unit 120 through the channel in the base pipe body 100; meanwhile, the oxygen delivery pipe 210 is externally connected with an existing oxygen bottle or an oxygen delivery unit, oxygen is delivered to a designated position, mixing of air and oxygen is achieved, and mixed gas formed after mixing is output to a pipeline of the breathing machine from the output port 110 through the diversion cone 300.

The beneficial effects produced by the application are that the conical part 220 is arranged at the front end of the oxygen conveying pipe 210 and the conveying holes 221 are arranged on the pipe wall of the conical part 220, so that the initial movement direction of most of oxygen before mixing is vertical to the initial movement direction of air, and then the oxygen enters the mixing cavity 230 along with the air to be mixed, so that the mixing uniformity of the air and the oxygen is improved; and the generation of vortex in the flow of the mixed gas can be suppressed by the provided deflector cone 300, and the noise in the flow of the mixed gas can be reduced.

In the present application, the oxygen delivery pipe 210 may be connected to the first pipe 200 by direct welding, and a sealing device should be disposed at the connection between the oxygen delivery pipe 210 and the first pipe 200. And an oxygen delivery pipe joint 211 is further arranged between the oxygen delivery pipe 210 and the base pipe body 100, and is used for the fast butt joint with an external oxygen source in the structure. In addition, in order to further improve the mixing effect of the oxygen and the air, the axis of the selected conical part 220 can be selected to coincide with the axis of the first tube 200, and a plurality of delivery holes are uniformly arranged on the circumference of the conical part 220, so that the mixing effect of the air and the oxygen can also be improved; and a cylindrical portion should be formed at the rear end of the tapered portion 220 integrally with the tapered portion 220, so that oxygen can be more smoothly and effectively transferred to the tapered portion, thereby improving the mixing effect of air and oxygen.

Further, in other embodiments of the present application, the air inlet unit 120 includes an air inlet cover 121, and a filter 122 disposed at a front end of the air inlet cover 121; as shown in the drawings, in order to facilitate production and manufacture, the base pipe 100 is integrally formed into a tubular structure, a front end cap is disposed at the front end of the base pipe 100, an air inlet cap 121 is disposed at the rear end of the base pipe 100, and an output port 110 is disposed in the middle of the front end cap, and is used for outputting a mixed gas formed by air and oxygen from the base pipe 100; the air inlet cover 121 is formed with a plurality of holes for sucking air from the environment into the base pipe 100 when the power unit 410 operates. The whole structure is simple and reliable, and the assembly is convenient. Further, in order to improve the reliability of the ventilator, a filter 122 may be optionally disposed at the front end of the air inlet cover 121 for filtering impurities or moisture in the air, for example, a polyester filter 122 may be optionally disposed, so as to improve the quality of the air before mixing and improve the reliability of the structure of the present application.

Further, in other embodiments of the present application, a radiator 420 is further disposed at the front end of the power device; the heat sink 420 is provided to reduce the heat generated by the power unit 410 during operation, thereby increasing the service life of the structure of the present application, wherein the heat sink 420 may be selected from commercially available products, including fin heat sinks 420 or other existing structure heat sinks 420.

When the oxygen delivery pipe is used specifically, the front end of the oxygen delivery pipe 210 is provided with a tapered part 220, specifically, the aperture of the front end of the oxygen delivery pipe 210 is gradually reduced, and meanwhile, the side wall of the tapered part 220 is also provided with a delivery hole 221; by using the combination of the tapered part 220 and the delivery holes 221, after the oxygen reaches the tapered part 220, more oxygen is output outwards along the delivery holes 221 due to the reduction of the hole diameter, so that the initial movement direction of most of the oxygen before mixing is perpendicular to the initial movement direction of the air; at this time, a mixing chamber 230 is formed in the first tube 200 at the front end of the tapered portion 220, so that air and oxygen are sufficiently mixed; the uniformity of mixing of air and oxygen is improved. The axis of the delivery holes 221 may alternatively be perpendicular to the axis of the cone 220 or at other angles, where air and oxygen mix better when the axes are perpendicular. This application sets up toper portion 220 through in the front of oxygen delivery pipe 210, sets up delivery port 221 in toper portion 220 department simultaneously, improves on the one hand and reduces and adopt prior art structure central zone to have the phenomenon that the oxygen volume is big, has increased marginal area oxygen volume simultaneously to this lets air and oxygen mix at mixing chamber 230 more evenly.

In addition, in order to further improve the mixing effect of the oxygen and the air, the axis of the selected conical part 220 can be selected to coincide with the axis of the first pipe body 200, and a plurality of delivery holes 221 are uniformly arranged on the circumference of the conical part 220, so that the mixing effect of the air and the oxygen can also be improved; and a cylindrical portion should be formed at the rear end of the tapered portion 220 integrally with the tapered portion 220, so that oxygen can be more smoothly and effectively transferred to the tapered portion 220, thereby improving the mixing effect of air and oxygen.

Further, in other embodiments of the present application, the delivery hole 221 has a bell mouth shape. Specifically, in this application, the bell mouth shape means that the one end opening in oxygen delivery pipe 210 is less, and the one end opening outside oxygen delivery pipe 210 is great, through setting up the bell mouth shape, for the air in oxygen delivery pipe 210, it reduces at the stage speed that flows through the bell mouth, but pressure increases relatively to this improves the unordered form of oxygen after discharging from delivery orifice 221 more, also can let air and oxygen mix more evenly.

Further, in other embodiments of the present application, the mixing chamber 230 is provided with a constriction 231. Referring to the drawings, the constriction 231 is located at the front end of the oxygen delivery pipe 210, wherein the oxygen is discharged from the oxygen delivery pipe 210 and then mixed with air, and by providing the constriction 231 in the front end of the oxygen delivery pipe 210, that is, in the mixing chamber 230, the cross-sectional area is reduced by the constriction 231, so that the oxygen and the air can be more sufficiently mixed. Further, in other embodiments of the present application, the front end of the tightening portion 231 is provided with an enlarged portion 232. The mixing chamber 230 includes an enlarged portion 232 at the front end of the constricted portion 231 in addition to the constricted portion 231, and the uniformity of mixing oxygen and air can be further improved by mixing the gas with the change of fluid flow rate and pressure, i.e. the pressure is increased and the flow rate is lower when the gas flows from the constricted portion 231 to the enlarged portion 232; in the present embodiment, by using the combination of the contraction portion 231 and the expansion portion 232, after the oxygen gas comes out of the oxygen delivery pipe 210 and forms the mixed gas with the air, the mixed gas enters the contraction portion 231, and as the cross-sectional area of the contraction portion 231 is reduced, the gas flow rate is increased, the pressure is reduced, and the air and the oxygen gas can be further diffusion premixed; after the mixed gas passes through the throat pipe, the sectional area is suddenly increased, the gas flow speed is reduced, the pressure is increased, and the mixing of the air and the oxygen can be further promoted, so that the air and the oxygen are mixed more uniformly.

Further, in other embodiments of the present application, a first mounting portion 330201 is disposed outside the first pipe 200. In specific use, the first tube 200 can be used as a separate component, that is, as a component structure of a ventilator, and is connected to other components of the ventilator by the first attachment portion 330201 provided outside the first tube 200. The first mounting portion 330201 can be selected to be of a snap-fit type, or can be selected to have other connection modes.

Further, in other embodiments of the present application, the guide cone 300 is provided with a first guide body 310, and the first guide body 310 corresponds to the mixing cavity 230; the guide cone 300 is further provided with a second guide body 320, and the second guide body 320 corresponds to the output port 110. Specifically, the first flow conductor 310 is in the shape of a cone or a pyramid, and the first flow conductor 310 corresponds to the mixing chamber 230. By correspondence, it is meant that a centerline of first current carrier 310 overlaps a centerline of mixing chamber 230 and a rear end of first current carrier 310 extends into mixing chamber 230. When the mixed gas flows from the mixing cavity 230 to the breathing machine pipeline, the resistance of the gas path flow channel is small due to the arrangement of the first flow guide body 310, and meanwhile, the first flow guide body 310 corresponds to the mixing cavity 230, so that the generation of vortex can be inhibited, and the noise in the flow of the mixed gas is reduced; and through setting up first baffle 310, also can reduce and mix other power loss, reduce the self-consumption.

Further, in other embodiments of the present application, a second flow guiding body 320 is further disposed on the flow guiding cone 300, wherein the first flow guiding body 310 is located at the rear end of the flow guiding cone 300, the second flow guiding body 320 is located at the front end of the flow guiding cone 300, and the second flow guiding body 320 corresponds to the output 110. In this application, only one outlet 110 may be selectively provided, and compared to the prior art in which a plurality of outlets 110 are used to reduce the eddy current, the structure in which the second flow guiding body 320 is combined with the outlet 110 is adopted in this application, which not only can reduce the fluid loss, but also can reduce the eddy current more effectively. In particular use, as shown, where the output port 110, the second baffle 320, the first baffle 310, and the mixing chamber 230 are all on the same axis, the dead space in the chamber where the overall mixed gas flows is small; the mixed air walks from back to front along the axis, and through setting up two baffle bodies, can reduce the flow resistance, better suppression mist produces the vortex in service.

Further, in other embodiments of the present application, reference is made to the accompanying drawings; to further reduce drag, the taper of second current carriers 320 may be selected to be greater than the taper of first current carriers 310; in specific use, the front end of the second flow guiding body 320 extends into the output port 110, and further, a third flow guiding portion is further disposed at the output port 110, wherein the third flow guiding portion may be in a bell mouth shape with a small front and a large rear; the third diversion parts correspond to the second diversion body 320, both of which can guide the mixed gas, and are more favorable for inhibiting the generation of vortex when the mixed gas flows to the output port 110.

Further, in other embodiments of the present application, the guide cone 300 is provided with a mounting portion 330, a front end of the mounting portion 330 is the second guide body 320, and a rear end is the first guide body 310. As shown in the drawings, the guiding cone 300 has an integrated structure, the middle of the guiding cone is a cylindrical mounting portion 330, the side of the front end close to the output port 110 is a second guiding body 320, and the rear end is a first guiding body 310; overall structure is simple, can select to set up the support in basic pipe body 100 through installation department 330 for fixed water conservancy diversion awl 300.

In other embodiments of the present application, in order to improve stability of the mounted deflector cone 300, in the present application, a step surface is formed at a connection portion between an end of the first deflector 310 and the mounting portion 330; optionally, one or more first supports 103 may be disposed in the base pipe 100, as shown in the figure, a structure for supporting the guide cone is formed on one side of the plurality of first supports 103 close to the center of the base pipe 100, and the guide cone 300 is provided with a step structure, so that other components are mixed in the flow, and the step surface is attached to the side surface of the first support 103, thereby improving the stability of the guide cone 300 in use; and also facilitates installation and maintenance of the deflector cone 300.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An empty oxygen mixing arrangement for breathing machine which characterized in that: the oxygen-enriched air purifier comprises a power unit (410) and a basic pipe body (100) connected with the power unit (410), wherein a first pipe body (200) is further arranged in the basic pipe body (100), an oxygen conveying pipe (210) is sleeved in the first pipe body (200), a conical part (220) is arranged at the front end of the oxygen conveying pipe (210), and a conveying hole (221) is formed in the pipe wall of the conical part (220); a mixing cavity (230) is also arranged in the first pipe body (200), and the mixing cavity (230) is positioned at the front end of the conical part (220); the front end of the basic pipe body (100) is provided with an output port (110), the rear end of the basic pipe body is provided with an air inlet unit (120), and the air inlet unit (120) corresponds to the first pipe body (200); the mixing device also comprises a guide cone (300) arranged in the base pipe body (100), wherein the guide cone (300) is positioned between the output port (110) and the mixing cavity (230).

2. The air-oxygen mixing device for the breathing machine according to claim 1, wherein: the air inlet unit (120) comprises an air inlet end cover (121) and a filter (122) arranged at the front end of the air inlet end cover (121).

3. The air-oxygen mixing device for a respirator according to claim 1 or 2, characterized in that: the front end of the power device is also provided with a radiator (420).

4. An air and oxygen mixing device for a respirator according to claim 1 or 2, wherein: the mixing cavity (230) is provided with a tightening part (231), and the front end of the tightening part (231) is also provided with an expanding part (232).

5. The air-oxygen mixing device for a respirator according to claim 3, wherein: the mixing cavity (230) is provided with a tightening part (231), and the front end of the tightening part (231) is also provided with an expanding part (232).

6. The air-oxygen mixing device for a respirator according to claim 1, 2 or 5, wherein: a first flow guide body (310) is arranged on the flow guide cone (300), and the first flow guide body (310) corresponds to the mixing cavity (230); the diversion cone (300) is further provided with a second diversion body (320), and the second diversion body (320) corresponds to the output port (110).

7. The air-oxygen mixing device for a respirator according to claim 6, wherein: the output port (110) is provided with a third flow guide part, and the third flow guide part corresponds to the second flow guide body (320).